39 lines
954 B
JavaScript
39 lines
954 B
JavaScript
export const subtract = (a, b) => ({
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x: a.x - b.x,
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y: a.y - b.y,
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z: a.z - b.z
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});
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export const add = (a, b) => ({
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x: a.x + b.x,
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y: a.y + b.y,
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z: a.z + b.z
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});
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export const scale = (v, factor) => ({
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x: v.x * factor,
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y: v.y * factor,
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z: v.z * factor
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});
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export const divide = (v, factor) => ({
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x: v.x / factor,
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y: v.y / factor,
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z: v.z / factor
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});
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export const cross = (a, b) => ({
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x: a.y * b.z - a.z * b.y,
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y: a.z * b.x - a.x * b.z,
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z: a.x * b.y - a.y * b.x
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});
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export const equals = (a, b) => a.x === b.x && a.y === b.y && a.z === b.z;
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export const almostEquals = (a, b) => Math.abs(a.x - b.x) < 0.001 && Math.abs(a.y - b.y) < 0.001 && Math.abs(a.z - b.z) < 0.001;
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export const length = (v) => Math.sqrt(v.x * v.x + v.y * v.y + v.z * v.z);
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export const distanceTo = (a, b) => length(subtract(a, b));
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export const normalize = (v) => {
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const l = length(v);
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return {
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x: v.x / l,
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y: v.y / l,
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z: v.z / l
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};
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};
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